A unit of measure is present in any area of human activity as the generally accepted equivalent of measuring something. Volume, length, weight - the most common of the existing ones. On different continents, in different languages and, regardless of religion, we use the same measurement measures. For a person it is convenient, accessible and understandable, does not require any conversion actions, which often leads to errors.
With the advent of the computer in human life, there was also a need to create a single unit for measuring the amount of information. Yes, such that it was perceived by both Chinese, and American, and any other computer in the world. All programmers in the world could use it as a single language. So the binary logarithm of the bit appeared.
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The prefixes kilo-, mega- and so on remain with their usual factors. Kilo - a thousand, mega - a million. For computer technology, it is right to use a factor of not 1000, but 1024. He also invented a name - kibi. That is, the correct prefixes and factors will be: kibi-, mibi- and further.